Golde-boy Posted February 8, 2017 Report Share Posted February 8, 2017 I recently installed a 45 DCOE on my L16 stock. It idles fine but when I try accelerating it stumbles. It revs fine sitting but driving is when it doesn't want to go. Need help Quote Link to comment
Crashtd420 Posted February 8, 2017 Report Share Posted February 8, 2017 By stock i assume you mean it has the 210 head and no cam.. Not sure but that maybe to much for a stock l16 I could be wrong.... you said you just installed it? Where did it come from? On What type of intake?... what was on the engine for a carb before? Did you do anything with the timing?... thats probably the first line of questing you'll get with this question.. Quote Link to comment
Golde-boy Posted February 8, 2017 Author Report Share Posted February 8, 2017 It is completely stock no cam. It has a canon manifold and before it had a ford escort carb that the previous owner had put on. The carb is freshly rebuilt Quote Link to comment
Golde-boy Posted February 8, 2017 Author Report Share Posted February 8, 2017 The vacuum the line to the distributor is not hooked up because I have no idea on how to hook it up. The distributor is EI Quote Link to comment
Crashtd420 Posted February 8, 2017 Report Share Posted February 8, 2017 Well one thing I was told is not to hook up the vacuum on a side draft weber so that part is good .. and you need to change your vacuum advance to all mechanical... 1 Quote Link to comment
datzenmike Posted February 8, 2017 Report Share Posted February 8, 2017 The 210 head is the stock head for the L16. By the description this is an un modified engine. If this ran properly before with the other carb there is no reason to think this is ignition related and has everything to do with the Weber. As engine load increases.. (accelerating the weight of a vehicle) more gas is needed. Revving in neutral only accelerates the small amount of spinning engine parts. If it bogs when driving then there's not enough gas being delivered. This applies to all carburetors not just a Weber. This could be that the jets are too small. Could be that the jet or jets are partly blocked with a piece of dirt or foreign matter. In some cases under high demand conditions (full throttle) if the float is set too low the engine will empty the carb and basically it runs out of gas but will recover and idle fine. Quote Link to comment
Crashtd420 Posted February 9, 2017 Report Share Posted February 9, 2017 I guess I assumed the old carb was on a different intake... if he always had the cannon intake and only swapped the carb then I would agree ... Quote Link to comment
banzai510(hainz) Posted February 9, 2017 Report Share Posted February 9, 2017 advance the distributor a bit. whats the timming light say at idle. try 14btdc I don't know if webers have a acell diaphrame type pump. Mikunis do and I seen them installed backward before where is wasn't working so no gas was being pushed when you give it gas. get a 32/36 DGV 5A and just accept it 1 Quote Link to comment
datzenmike Posted February 9, 2017 Report Share Posted February 9, 2017 I guess I assumed the old carb was on a different intake... if he always had the cannon intake and only swapped the carb then I would agree ... The intake has very little to do with this as it's just an air tight pipe or pipes to connect carb to head. Quote Link to comment
Crashtd420 Posted February 9, 2017 Report Share Posted February 9, 2017 I was thinking more downdraft vs side draft ... I didn't think that type of a change was as easy as bolt the new setup on and change nothing else... still learning. Quote Link to comment
datzenmike Posted February 9, 2017 Report Share Posted February 9, 2017 A single side draft is more direct line so air doesn't have to make a 90 degree change in direction. There would be some small gain from this over a down draft, all things equal. Dual side draft webers or Individual throttle bodies, one per cylinder, are slightly better again and you can tune the runner length. On a stock L16 the gains are smaller than if a modified engine that can use the extra carburetion. Quote Link to comment
wayno Posted February 9, 2017 Report Share Posted February 9, 2017 The first thing I would ask you is if you port matched the head to the intake manifold, the 210 head has small intake ports, most side draft intake manifolds have large ports, so if you bolted up a large intake runner manifold to a small port head, your going to have issues, I have heard they can not be tuned. The issue is that the air in the big intake runner has to go into a small hole, it's like a hundred people trying to rush into one small door, it just don't work, the flow isn't smooth, it hits the bottle neck and turns into turbulence, it just don't flow properly. 1 Quote Link to comment
datzenmike Posted February 9, 2017 Report Share Posted February 9, 2017 Port matching is always a good idea but it would still run and drive normally and wouldn't affect part throttle low and mid range speed. Might prevent you realizing the full potential of a side draft at full throttle. Try to drive it around for 1/2 hour and then pull the plugs and 'read' them. Are the 1 and 4 plugs a different shade than the 2 and 3? Normal color of a reasonably good air fuel ratio is a light tan color on the porcelain. Darker is richer with black sooty extremely rich and very light or cream color is leaner. White porcelain is extremely lean running. Overly rich will still run. Overly lean will lack any power. Quote Link to comment
Golde-boy Posted February 9, 2017 Author Report Share Posted February 9, 2017 I will try to drive it and see how the spark plugs are. I live in California and don't know any Datsun experts. I will like to the car itself and let some one more experienced figure out Quote Link to comment
Golde-boy Posted February 9, 2017 Author Report Share Posted February 9, 2017 I would like to take the car to someone who specializes in datsuns or webers Quote Link to comment
Draker Posted February 9, 2017 Report Share Posted February 9, 2017 Where are you in California? Quote Link to comment
banzai510(hainz) Posted February 9, 2017 Report Share Posted February 9, 2017 you ck the timming on distributor with a light? unless they deal with webers daily I would not take it to someone yet as they will take YOU!!!!!!!!! Quote Link to comment
Golde-boy Posted February 9, 2017 Author Report Share Posted February 9, 2017 Inland empire. I have never used a timing light Quote Link to comment
banzai510(hainz) Posted February 9, 2017 Report Share Posted February 9, 2017 maybe motor is not even timed? datsuns? timming light is a must!!!!!!!!!!Buy one or borrow one and learn how to use it. crap maybe you still have points and they are shot. take photo of motor, distribuor and the coil area. 1 Quote Link to comment
Golde-boy Posted February 9, 2017 Author Report Share Posted February 9, 2017 I had the engine rebuilt from top to bottom. It's has been about a year since. But total time the car has been on the streets is about 8 momths Quote Link to comment
banzai510(hainz) Posted February 9, 2017 Report Share Posted February 9, 2017 that don't mean noting to me if the motor is not timed rebuilt or not. Maybe you putthe dist in off a tooth and that is whats making it bog out cause your going out of time as the dist advances if motor ran fine with a downdraft set up then you installed this other carb we got to know we are not mind readers to the history of this motor /car. 1 Quote Link to comment
Draker Posted February 9, 2017 Report Share Posted February 9, 2017 Post some pictures and let us help you. I'm pretty sure we could guide you through this.. And you might even learn something. 1 Quote Link to comment
Golde-boy Posted February 9, 2017 Author Report Share Posted February 9, 2017 Alright. I'll take pics tomorrow and post them Quote Link to comment
banzai510(hainz) Posted February 9, 2017 Report Share Posted February 9, 2017 buy/borrow a timming light otherwise youll never figure out a L motor olddatsuns.com read the tech section a 1000 times then ask questions. one guy I was helping to told him what to ck and he wouldnt do it. Just to find out the points were out of adjustment. I told him how to do it!!!!! but that was still to much. These are EZ cars. then another car the guy put a Supercoil on with out adding another ballast resisitor (still had point ignition) car wouldnt go down the street with out popping. thought carbs went bad. But was just needed a ballast another put a different dist on and the pedastal was not matching which thew it of timming Or buying other peoples JUNK SO!!!!!!!!!!be honest dont be changing shit just to change it. 2 Quote Link to comment
Crashtd420 Posted February 9, 2017 Report Share Posted February 9, 2017 Well said hainz... Datsuns are definitely hands on learning... Quote Link to comment
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